Allocate New York State adjustments

In 2023, I was a part-year Yonkers resident. When preparing the NY state return I came to a screen titled "Allocate New York State Adjustments". The text says: "Because your residence changed during 2023 you must allocate your New York State adjustments of $X based on the time you spent as a resident of New York City or Yonkers... Your New York State Adjustments below must equal $X." This number doesn't look familiar to me. Where can I find out how this number was calculated?